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.GALEB C. WALWORIH, OF BOSTON, MASSACHUSETTS.

` VISE.

Specication of Letters Patent No. 15,862, dated October 7, 185.l

To all 'whom t may concern Be it known thaty I, CALEB C. WALwoRTH, of the city of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and Improved Vise; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, and the letters of refer-` ence thereon marked.

Figure l` is a sectional elevation.J Fig. 2, a plan, and Fig. 3, an angular view of the base showing notches therein.

Similar letters indicate similar parts in all the figures. l

The nature of my invention consists in certain devices whereby t-wo vises are so ar-` ranged as to revolve about a common center, and which may be locked firmly in any determined position for the purpose of facilitating the performance of certain mechanical operations, and which I call a compound revolving vise.

The particular use to which I have applied my invention is to hold gas pipe fittings for the purpose of tapping', screwing and boring them. j

To enable others skilled in the art to make and use my invention I will describe its construction and operation.

(A) is the base or bed which supports the vise and by which the vise is secured on the machine to which it is to be applied; a hole in the base receives the pivot (B) (seen in dotted lines in Fig. l) secured at the bottom by a pin and washer or other suitable device from being withdrawn, but allowed to revolve freely` therein. Above the base the compound vise is firmly secured to the pivot; it consists of an upright cylinder (C) with grooves made within it in which are fitted the jaws (D D D D) so as to slide vertically therein, each pair Aof which is act-uated by a right and left hand screw (E) andis worked independent of the other by means of the wrench or handle (F) the opening of the jaws always being equi-distant from a middle position. A lever (G) jointed to the pivot (B) passes through a corresponding aperture in the vise and drops into either of the notches (I-l) in the base, thus locking the vise in either position and when raised forms a convenient means of revolving the vise about its center.

The operation of the compound revolving viseis as follows: It is secured by the base` in its proper position to t-he machine for tapping fittings5 the article to be tapped is secured in one pair of the jaws by turning its screw in the proper direction, then by raising the lever (G) and turning the vise with it one half a revolution the fitting to be tapped is presented in its proper position to be operated upon by the machine for that purpose, the lever is dropped into the notch and the vise is locked secure from turning. While the first tting is being tapped the operator secures another fitting 7 in the opposite pair of jaws which is now nearest to him; the first litting being finished the lever (G) is raised and the vise turned one half a revolution and locked by the lever dropping into the opposite notch in the base, presenting the second fitting to the operation of tapping: the rst one is meanwhile removed and a new one substituted and the operation described repeated.

The operator by this device is enabled to keep his machine in operation all the time ordinarily employed` in removing and replacing the article to be wrought upon, thereby increasing the product of the machine.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

The arrangement of two vises so as to re volve about a common center, and locking the same in any desired position by means of the lever (Gr) and notches or any other suitable device, substantially in the manner and for the purpose set forth.

O. O. WALWORTH. y

Witnesses:

G. B. CROSBY, M. H. MERRIAM. 

